
Why Henan Deman Packing’s 100% Bright Polyester Bag-Closing Thread Delivers Unbeatable Value
At Henan Deman Packing Co., Ltd., we understand that in today’s fast-paced packaging industry, every cent counts—and so does every stitch. That’s why our 100% bright polyester (PET) bag-closing thread is engineered not just to meet, but to exceed, the demanding needs of modern manufacturers. Here’s why choosing Deman’s premium thread is the smartest investment you can make.
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Superior Fiber Luster and Consistency
We source 100% bright polyester staple fiber, which offers a higher degree of crystallinity and uniformity compared to the semi-dull fibers commonly used by others. That translates to:-
Brighter appearance—enhancing the visual quality of sealed bags.
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Tighter molecular structure—yielding consistently smooth surfaces and fewer weak spots.
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Higher Tensile Strength
At equivalent thread thickness, Deman’s bright-fiber thread registers approximately 10% greater breaking strength than the market average. This means fewer thread breaks on high-speed machines and less downtime for your production line.

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ISO 9001:2015–Certified Process
From raw-material inspection to final spooling, every step is governed by our ISO-certified quality management system. -
100% In-Line Testing
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Tensile‐strength checks on every bobbin
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Diameter and twist uniformity measurements
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Visual inspection for color consistency and absence of neps or fluffs
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Traceability
Batch numbers and detailed test reports accompany every shipment, ensuring you always know exactly what you received—and why it will perform.
100% In Line Testing
ISO 9001:2015
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EU Regulation No. 10/2011 Compliance
Our thread has been tested and approved for indirect food contact under the European Union’s stringent “Plastics in Food Contact” framework. -
FDA CFR Title 21 Conformity
Meets U.S. Food and Drug Administration guidelines for materials in contact with food. -
Non-Toxic, Non-Migratory
Our polyester formulation passes migration tests, ensuring no harmful substances transfer to your packaged goods—ideal for food-grade bag closures in grains, powders, and granular foods.
Deman’s thread is perfectly tuned for the world’s leading bag-closing machines:
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FISCHBEIN (e.g., Model F100)
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NEWLONG (e.g., Model Ds-9)
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UNION SPECIAL
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YAO-HAN,WAIG and more
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With precise control over twist, lubrication, and diameter, you’ll experience smooth feeding, minimal tension spikes, and virtually no jams—even at line speeds exceeding 300 bags per minute.